Ubuntu Tweak 0.4.9 has been released, a great application for tweaking settings in Ubuntu (Hardy, Intrepid, Jaunty or the latest development Karmic). From this version, Ubuntu Tweak has different package for i386 and amd64 and works for Karmic too.

Among the improvements and new features:

-Separated Source List: you will have a more manageable way with Third Party Sources. By default, Ubuntu Tweak will save the third party sources into its own file under /etc/apt/sources.list.d/

When you open the Source Editor, Ubuntu Tweak will show you the main sources.list in the window.

And you can select the drop down menu to view or edit the other list files. They are stored in /etc/apt/sources.list.d/.